Limit cached entry sizes

1MB and no limit for number of entries except for attachments, where we
limit individual entries to 2MB and total of entries to 500. The number
is based on the following percentiles for Active Storage blobs:

```
p50: 97.1044921875 KB
p75: 236.9140625 KB
p90: 917.7548828125 KB
```

app/views/pwa/service_worker.js.erb

@@ -9,7 +9,8 @@ TurboOffline.addRule({
     cacheName: "main",
     maxAge: 60 * 60 * 24 * 3,
     networkTimeout: 3,
-    fetchOptions: { cache: "no-cache" }
+    fetchOptions: { cache: "no-cache" },
+    maxEntrySize: 1024 * 1024
   })
 })
 
@@ -17,7 +18,8 @@ TurboOffline.addRule({
   match: /\/assets\/.+[-\.][0-9a-f]+\.(js|css|svg|png|jpg|webp|woff2?|ico)$/,
   handler: TurboOffline.handlers.cacheFirst({
     cacheName: "assets",
-    maxAge: 60 * 60 * 24 * 7
+    maxAge: 60 * 60 * 24 * 7,
+    maxEntrySize: 1024 * 1024
   })
 })
 
@@ -27,7 +29,8 @@ TurboOffline.addRule({
   handler: TurboOffline.handlers.networkFirst({
     cacheName: "main",
     maxAge: 60 * 60 * 24 * 3,
-    networkTimeout: 2
+    networkTimeout: 2,
+    maxEntrySize: 1024 * 1024
   })
 })
 
@@ -36,7 +39,9 @@ TurboOffline.addRule({
   handler: TurboOffline.handlers.networkFirst({
     cacheName: "storage",
     maxAge: 60 * 60 * 24 * 7,
-    networkTimeout: 2
+    networkTimeout: 2,
+    maxEntrySize: 2 * 1024 * 1024, // 2MB covers about 95% of all Fizzy blobs
+    maxEntries: 500
   })
 })
 
@@ -45,7 +50,8 @@ TurboOffline.addRule({
   handler: TurboOffline.handlers.networkFirst({
     cacheName: "main",
     maxAge: 60 * 60 * 24,
-    networkTimeout: 3
+    networkTimeout: 3,
+    maxEntrySize: 1024 * 1024
   })
 })